ICS557G-05A IDT, Integrated Device Technology Inc, ICS557G-05A Datasheet

IC CLK SOURCE QUAD DIFF 20-TSSOP

ICS557G-05A

Manufacturer Part Number
ICS557G-05A
Description
IC CLK SOURCE QUAD DIFF 20-TSSOP
Manufacturer
IDT, Integrated Device Technology Inc
Type
Clock Generatorr
Datasheet

Specifications of ICS557G-05A

Input
Clock, Crystal
Output
HCSL, LVDS
Frequency - Max
200MHz
Voltage - Supply
3.135 V ~ 3.465 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
20-TSSOP
Frequency-max
200MHz
Number Of Elements
1
Supply Current
105mA
Pll Input Freq (min)
25MHz
Operating Supply Voltage (typ)
3.3V
Operating Temp Range
0C to 70C
Package Type
TSSOP
Output Frequency Range
Up to 200MHz
Operating Supply Voltage (min)
3.135V
Operating Supply Voltage (max)
3.465V
Operating Temperature Classification
Commercial
Pin Count
20
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
557G-05A

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QUAD DIFFERENTIAL PCI-EXPRESS CLOCK SOURCE
Description
The ICS557-05A is a spread-spectrum clock generator that
supports PCI-Express requirements. It is used in PC or
embedded systems to substantially reduce
electro-magnetic interference (EMI). The device provides
four differential HCSL or LVDS high-frequency outputs with
spread spectrum capability. The output frequency and
spread type are selectable using external pins.
Block Diagram
IDT® QUAD DIFFERENTIAL PCI-EXPRESS CLOCK SOURCE
crystal or
25 MHz
clock
Optional tuning crystal
capacitors
SEL[2:0]
X2
X1
3
Spectrum/
Oscillator
selection
Spread
Output
Clock
clock
GND
VDD
Spectrum
PLL Clock
Synthesis
2
Circuitry
2
1
Spread
Features
Packaged in 20-pin TSSOP
RoHS 5 (green) or RoHS 6 (green and lead free)
complaint package
Supports PCI-Express applications
Four differential spread spectrum clock outputs
Spread spectrum for EMI reduction
Uses external 25 MHz clock or crystal input
Power down pin turns off chip
OE control tri-states outputs
Spread and frequency selection via external pins
Spread Bypass option available
Industrial temperature range available
PD
Rr(IREF)
OE
CLKOUTB
CLKOUTA
CLKOUTA
CLKOUTD
CLKOUTD
CLKOUTB
CLKOUTC
CLKOUTC
ICS557-05A
DATASHEET
ICS557-05A
REV N 032311

Related parts for ICS557G-05A

ICS557G-05A Summary of contents

Page 1

QUAD DIFFERENTIAL PCI-EXPRESS CLOCK SOURCE Description The ICS557-05A is a spread-spectrum clock generator that supports PCI-Express requirements used embedded systems to substantially reduce electro-magnetic interference (EMI). The device provides four differential HCSL or LVDS high-frequency ...

Page 2

ICS557-05A QUAD DIFFERENTIAL PCI-EXPRESS CLOCK SOURCE Pin Assignment 1 VDDXD GNDXD 9 IREF 10 20-pin (173 mil) TSSOP Spread Spectrum Selection Table Spread% ...

Page 3

ICS557-05A QUAD DIFFERENTIAL PCI-EXPRESS CLOCK SOURCE Pin Descriptions Pin Pin Pin Name Type 1 VDDXD Power 2 S0 Input 3 S1 Input 4 S2 Input 5 X1 Input 6 X2 Output Crystal connection. Connect to a fundamental mode crystal or ...

Page 4

ICS557-05A QUAD DIFFERENTIAL PCI-EXPRESS CLOCK SOURCE Application Information Decoupling Capacitors As with any high-performance mixed-signal IC, the ICS557-05A must be isolated from system power supply noise to perform optimally. Decoupling capacitors of 0.01µF must be connected between each VDD and ...

Page 5

ICS557-05A QUAD DIFFERENTIAL PCI-EXPRESS CLOCK SOURCE Output Structures IREF =2.3 mA See Output Termination Sections - Pages Ω R 475 R General PCB Layout Recommendations For optimum device performance and lowest output phase noise, the following guidelines ...

Page 6

ICS557-05A QUAD DIFFERENTIAL PCI-EXPRESS CLOCK SOURCE PCI-Express Layout Guidelines Common Recommendations for Differential Routing L1 length, Route as non-coupled 50 ohm trace. L2 length, Route as non-coupled 50 ohm trace. L3 length, Route as non-coupled 50 ohm trace ...

Page 7

ICS557-05A QUAD DIFFERENTIAL PCI-EXPRESS CLOCK SOURCE LVDS Compatible Layout Guidelines Alternative T ermination for LVDS and other Common Differential Signals Vdiff Vp-p Vcm 0.45v 0.22v 1.08 0.58 0.28 0.6 0.80 0.40 0.6 0.60 0.3 1.2 R1a = R1b = R1 ...

Page 8

ICS557-05A QUAD DIFFERENTIAL PCI-EXPRESS CLOCK SOURCE Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the ICS557-05A. These ratings are stress ratings only. Functional operation of the device at these or any other conditions above ...

Page 9

ICS557-05A QUAD DIFFERENTIAL PCI-EXPRESS CLOCK SOURCE AC Electrical Characteristics - CLKOUT, HCSL Unless stated otherwise, VDD=3.3 V ±5%, Ambient Temperature -40 to +85° C Parameter Symbol Input Frequency Output Frequency 1,2 Output High Voltage V OH 1,2 Output Low Voltage ...

Page 10

ICS557-05A QUAD DIFFERENTIAL PCI-EXPRESS CLOCK SOURCE AC Electrical Characteristics - CLKOUT, LVDS Unless stated otherwise, VDD=3.3 V ±5%, Ambient Temperature -40 to +85° C Parameter Input Frequency Output Frequency Differential Output Voltage Offset Voltage ∆ ∆ ...

Page 11

ICS557-05A QUAD DIFFERENTIAL PCI-EXPRESS CLOCK SOURCE Package Outline and Package Dimensions Package dimensions are kept current with JEDEC Publication No INDEX AREA Ordering Information Part / Order Number Marking 557G-05ALF 557G-05ALF 557G-05ALFT 557G-05ALF ...

Page 12

ICS557-05A QUAD DIFFERENTIAL PCI-EXPRESS CLOCK SOURCE Innovate with IDT and accelerate your future networks. Contact: www.IDT.com For Sales 800-345-7015 408-284-8200 Fax: 408-284-2775 Corporate Headquarters Integrated Device Technology, Inc. www.idt.com © 2011 Integrated Device Technology, Inc. All rights reserved. Product specifications ...

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